How to switch to a buffer in another frame?

[whatacold]

Hi,

Say there are two frames and I am woking on a buffer on frame 1, which is maximized, after some time I want to change to a specific buffer in frame 2, how to achive that?

I've tried M-x ace-window, but it only shows the window labels of frame 1, I can't change to frame 2 without the window labels of frame 2.

I've read README and in Usage section of README, it says:

ace-window works across multiple frames, as you can see from the in-action gif.

But I can't figure out how the second frame in the gif, which contains the *scratch* buffer, is popped out, would you shed me some light?

Thanks.

[abo-abo]

Even if the frame isn't visible, you can still select it using the corresponding char. If you can guess it, that is.

I don't know how this can be improved further. Suggestions welcome.